Simulation of Impact Initiation of Explosives Based on a Meshless Method

In this paper, the conservative reproducing kernel smoothed particle hydrodynamic (CRKSPH) method is used to simulate the impact initiation process of ANFO and predict the propagation of shock waves arising from the detonation inside the shell and the resultant shell deformation. In calculations, the use of CRKSPH is found to effectively improve calculation accuracy. The explosive reaction and product expansion process are characterized by the JWL++ equation of state (EOS). The calculation results reproduce the impact ignition process by fragments, explosive detonation process, shell deformation response, and explosive reaction distribution. This study quantitatively analyzes the physical value of three measure points and finds the evolution rule, which is of certain guiding significance for the research on ammunition safety. In addition, this study shows that CRKSPH is practically valuable in calculating the impact initiation of explosives.